Steel retainer for percussive drills



Sspt. 3, 1929. L. L. RICHARDSON ,0

STEEL RETAINER FOR PERCVLISSIVE DRILLS Filed April 25, 1927 N VEN TOR.

By. A TTORNEY.

Patented Sept. 3, 1929.

I TED LS EN T [CE LED LKEICHARDSON, OF CLEVELAND; OHIO, ASSIGNOR' TO THECLEVELAND'J"ROCK DRILL COMPANY, OF TGLEVELANDfOHIO.

STEEL RETAINER FOR' PERGUSSIVEIDRILLS.

Application filed April 25,

"The present invention is directed'toimprovements in steel retainers for percussive drills.

The primary object of the invention is to 5. provide a device of this character so constructed that the retainer can be easily and quickly moved to its ,open or closed position and positively held in either of such positions.

Another object of the-invention is to provide a device of this kind which will effective ly hold the drill steel against accidental disengagement'from the drill front head, the

. construction being such that when the drillsteel strikes the retainer shocks incident 1 thereto will be absorbed and injury to the re-v tainer prevented.

Another object of the invention is to provide a steel retainer which is simple in construction, efiicient in operation, and durable.

In the accompanying drawing Figure 1 is a perspective View of the device.

Figure 2 is a longitudinal sectional view.

Figure 3 is a fragmentary top plan View.

Figure 4 is a sectional view on line 4 -4 of Figure 2.

Referring to the drawing, 1 designates the front head of a percussive drill which has a boss 2 formed integral therewith, said boss having a longitudinal opening 3 therein and in which is slidable the bolt shank 4. A nut 5 is engaged upon the rear end of the shank 4 and interposed between said nut and boss is a coil spring 6, which encircles the shank. The outer end of the shank is providedwith a rectangular head 7.

The boss 2 has formed in its outer face a, recess 8 and resultant flat faces 9, the purpose of which will be later explained.

The retainer per se includes a body 10 consisting of angularlv disposed integrally con nected arms 11 and 12, the arm 12 having an opening 13, rectangular in shape, and in which the head 7 of the bolt engages, the shank thereof being engaged in the inclined opening 14 formed in the rear wall 15 of the opening 13, said wall having inclined shoulders 16 formed therein and located upon opposite sides of the opening 14. The rear side of the wall 15 is provided with an extension 17 adapted to fit in the recess 8, there being angularly disposed shoulders 18 and 19 formed upon the opposite sides of the extension for co-operation with the flat faces 9.

The arm 11 has a longitudinal slot 20 therein which extends from the ear 21 and has its 1927. :Serial No.-186,441.

upper end opening into the substantially semi-circular opening 22 formed in thesouter end of the arm l2, said: slot and opening, forming, in effect, a key-hole slot 23.

The drill steel 24: is engagedin the bore' 26' of the front-head l and'is collar 27, as is customary.

' As shown in full lines in Figure 1 of the drawing, the body 10 of the retainerzis'in its provided with a closed position. and at which time the :slot 20 this manner it will be obviousthat when the retainer is in its closed position the retainer will be effectively interlocked with the fronthead of the drill. When in its closed position the shoulders 18 will engage the flat faces 9 and will be yieldably held engaged therewith through the medium of the spring 6 in an obvious manner, thus maintaining the retainer in its closed or operable position.

To release the drill steel it is only necessary to swing the retainer to the position as indicated in dotted lines in Figure 1, whereupon the opening 22 will coincide with the bore 26, and since the collar is smaller in diameter than the opening it can pass freely therethrough. When in this position the shoulders 19 are engaged with the fiat faces 9, the spring 6 maintaining them in yieldable engagement with said faces. Owing to the fact that the opening 14 is inclined the retainer can be swung to its open or closed position, and when in its opened position the rear surface of the head 7 will engage the shoulders 16.

The tension of the spring 6 is such that the retainer may be opened or closed upon grasping the ear 11, or if desired the ear can be struck with a hammer or other tool.

What is claimed is 1. The combination with a drill front head having a collared drill steel operatively connected thereto, a boss carried by the front head and having a recess therein, a drill steel retainer consisting of angularly disposed arms having communicating openings therein, an extension carried by one arm, a headed bolt yieldably engaged with the boss, said head being engaged with one of said arms for holding one arm of the retainer yieldably engaged with the boss and the extension in the recess.

2. The combination with the front head of a drill having a boss carried thereby, a bolt having a head, the shank of the bolt being slidable in the boss, a drill steel retainer consisting of angularly disposed arms, one arm having an opening therein and in which the bolt head engages, said arm having shoulders for engaging, respectively, the boss and bolt head, means for yieldably holding the shoulders engaged with said boss and head to maintain the retainer in open or closed position, said retainer having an opening and slot adapted to be selectively positioned to cooperate with the drill steel collar to retain the same in the front head or permit the release thereof.

3. The combination with a front head of a drill'having a collared drill steel operatively connected thereto, of a boss carried by the front head, a bolt slidable in the boss and having a head, a spring for restraining the bolt, a drill steel retainer including a pair of angularly disposed arms, one arm having an opening therein, said bolt being engaged with said arm and having its head engaged in said opening, shoulders formed upon the arm for engaging, respectively, the boss and bolt head, said retainer being rockable on the bolt, said shoulders serving to maintain the retainer in its open or closed position, and means carried by the retainer to be selectively positioned to permit the release of the drill steel from the front head or to prevent the removal thereof.

4. The combination with the front head of a drill having a collared drill steel operatively connected thereto, a boss carried by the front head and having a recess and resultant flat side faces, a bolt slidable in the boss and having a head, a drill steel retainer comprising a pair of angularly disposed arms having a communicating slot and openingformed therein, one of said arms being pivotally connected to the bolt and having an extension, angularly disposed shoulders on opposite sides of the extension and selectlvely engageable with the flat faces to hold the retainer in its open or closed position,

said extension being movable in the recess. In testlmony whereof I affix my signature,

LED L. RICHARDSON. 

